diff --git a/YACOSCore/ejbModule/org/yacos/core/users/Role.java b/YACOSCore/ejbModule/org/yacos/core/users/Role.java
index ea71b48..ebc9a9c 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/Role.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/Role.java
@@ -1,9 +1,10 @@
 package org.yacos.core.users;
 
+import java.io.Serializable;
+
 import javax.persistence.Entity;
 import javax.persistence.EnumType;
 import javax.persistence.Enumerated;
-
 import javax.persistence.Id;
 import javax.persistence.IdClass;
 import javax.persistence.JoinColumn;
@@ -20,7 +21,12 @@ import org.yacos.core.conferences.Conference;
  */
 @Entity
 @IdClass(RolePK.class)
-public class Role {
+public class Role implements Serializable {
+	
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
 	
 	/**
 	 * User for which this role is defined
@@ -50,12 +56,15 @@ public class Role {
 	private RoleType type;
 	
 	public Role(RoleType type,User user, Conference conference) {
-		super();
+		
 		setType(type);
 		setUser(user);
 		setConference(conference);
 	}
 	
+	public Role(){
+		
+	}
 	
 	public User getUser() {
 		return user;